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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A384251 The number of integers k from 1 to n such that the greatest divisor of k that is an infinitary divisor of n is odd.

Table of values

n a(n)
1 1
2 1
3 3
4 3
5 5
6 3
7 7
8 4
9 9
10 5
11 11
12 9
13 13
14 7
15 15
16 15
17 17
18 9
19 19
20 15
21 21
22 11
23 23
24 12
25 25
26 13
27 27
28 21
29 29
30 15
31 31
32 16
33 33
34 17
35 35
36 27
37 37
38 19
39 39
40 20
41 41
42 21
43 43
44 33
45 45
46 23
47 47
48 45
49 49
50 25
51 51
52 39
53 53
54 27
55 55
56 28
57 57
58 29
59 59
60 45
61 61
62 31
63 63
64 48
65 65
66 33
67 67
68 51
69 69

List of values

[1, 1, 3, 3, 5, 3, 7, 4, 9, 5, 11, 9, 13, 7, 15, 15, 17, 9, 19, 15, 21, 11, 23, 12, 25, 13, 27, 21, 29, 15, 31, 16, 33, 17, 35, 27, 37, 19, 39, 20, 41, 21, 43, 33, 45, 23, 47, 45, 49, 25, 51, 39, 53, 27, 55, 28, 57, 29, 59, 45, 61, 31, 63, 48, 65, 33, 67, 51, 69]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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